Fluid-feeding-pressure mechanism.



No. 897,676. PATENTEP SEPT. 1, 1908. G. THOMPSON.

PLUIE PEEDING PRESSURE MEGHANISM.

inventan operated by com ressed air. e

UNITED srAEsrAg-ENT OFFICE.

GEORGE THOMPSON, OF MANSFIELD, OHIO, ASSIGNOR OF ONE-HALF TO FRANK SVCHREIDT, OF MANSFIELD, OHIO.

FLUID-FEEDING-PRESSURE MECHANISM.

Specification of Letters Patent.

Patented Sept. v1, 1908.

Application led July 24, 1907. Serial No. 385,373.

similar devices.

It is well known to those skilled in the op-` eration of machine tools, that in order to produce the most efficient result in the least .possible time it is necessary for the feedof the machinel to be rigid and regular and underA This resulterfect control of the operator.

as heretofore been more or less satisfactorily attained b the use Ofvari/ous mechanical means whic operate with more or less efficiency.

Therefore the objects of my invention are: 1st. To construct a feed mechanism for machine tools or any other device which shall operate by finid pressure thereby dispensin with the mechanical means heretofore use Another ob] ect of my invention is the construction of a device of the class described which shall transmit a rigid and uniform and variable motion to the carriage to which it is attached.

A further object is the construction of a feed mechanism in combinationwith a governing device which shall enable the o erator to instantly control the speed of the eed.

A further object is the construction ofv a feed mechanism that may be easily attached to any machine desired.

I attain these and otherobjects by the mechanism illustrated in the accompanying drawings in which:

Fi ure 1 isa lon itudinal side elevation of my evice attache to a millin machinea'nd i 2 is aside evation of the our-way valve use to control the air supply. Fig. 3 is a cross section of Fig. 2, showing the ports in full and dotted lines. Fig. 4, is a sectional side elevation of a modification of the auxiliary cylinder showing counter-bore.

n the drawings, reference numeral 1 indicates' a bracket rigidly secured to -a milling made inte ral with the free end ofthe bracket 1, is provi ed with suitable heads 5 and 6 fitted to and rigidly secured to opposite ends ofthe cylinder 4 by bolts 7 assing through suitable openings in the hea s 5 and 6 and adapted to engage with the internal screw-threaded apertures formed in the fianges 8 and 9 made integral with the cylinder 4. An auxiliary cylinder 10 is fitted with suitable heads 11 and 12 provided with exterior screw threads adapted to engage with the internal screw threads formed in the ends of .the auxiliary cylinder.

A'cupped boss 13, made integral with the head 11, is provided with internal screw-threads adapted to engage with the exterior screwthreads formed on the cupped boss 14 made integral with the head 6 and thereby rigidly securing the cylinder 10 to cylinder 4 in concentric alinement therewith. The above structure is the referable construction. A piston rod 15 is tted to suitable o enings 16 1n the heads5 and 6 of cylinder 4 aving one end 17 projectin therefrom and fitted with screw-threads a a ted to engage with a threaded opening ormed in the end of the carriage 18 of themilling machine 2 or any other device that is provided with a feeding device and is rigidlysecured therein by a lock nut 19 fitted to the piston rod and adapted to contact with the end of the carriage. The o posite end 20 of the piston rod 15 projects t rough a suitable aperture 21 formed in the head 11 of cylinder 10 and is fitted with a iston 22 having internal screw threads ormed in the aperture 23 adapted to engage with the external screw-threads formed on -the reduced portion 24 of the piston rod 15.

The piston 22 is fitted to and adapted to reciprocate in cylinder 10 and is for a purpose hereinafter specified. A piston 25 having an internal screw-threaded aperture 26, adapted to en age with the external screw-threads forme on the enlarged portion 27 of the iston rod 15 is loosely fitted to and adapte to reciplrocate in cylinder 4. Cupped packing was ers 28 are fitted to opposite ends of the piston 24 vand are held there-against by nuts 29 fitted to the threaded portion 27 of the piston rod. The washers 28 are fitted to the cylinder 4 and are adapted to prevent leakage of air by the said piston. The stuffing box 30 made integral with the cylinder head machine 2 by bolts 3. A power cylinder 4,

Aone end connected to the four-Wa 5, is fitted with a suitable gland 31 and cap 32. A recess 33 is formed in the said stuffing box concentric with the piston rod 15 and is adapted to receive packing to prevent the escape of a-ir from the cylinder. The recess 34 formed in the boss 14 and surrounding the piston rod 15 is adapted to receive suitable packing to prevent the escape of the contentsl of the cylinders 4 and 10.

While any suitable valve may be used to control the supply of fluid,` I prefer to use a four-way valve as shown in the drawings. This controlling valve 35 may be placed in convenient reach of the operator and preferably connected with an a1r or steam supply pipe 36. Suitable pipes 37 and 38, having valve and the opposite ends to ports 39 an 40 formed in the walls of the cyhnder 4, form a connecting passage between the air or steam supply and the ower cylinder. A Referrlng to Fig. 3, the supply ipe 36 is connected with the port 41 and thell) 37 and 38 are connected' with ports 42 and 43 respectively. An exhaust plpe 44 is connected with a port 45 and leads to the atmosphere. A valve lug 46 is fitted to the valve case 46a and is a apted to be rotated therein by means of the lever 47. See Fig. 1.

Suitable ports 48 and 49 are formed in the valve plug 46 and form a means of communication between the ports 41 and 43, and4 42 and 45 res ectively; or When the valve is rotated oneourth revolution, they will form a means of communication between ports 42 and 41, and 43 and 45 respectively as shown by full and dotted lines in Fig. 3.

Op osite ends of the cylinder 10 have suita le apertures 50 and 51 communicating with the interior-thereof and are ada ted to receive opposite ends of the pipe line 52 thereby forming a by-pass. i A suitable valve 53 is included in the said pipe line and forms a means of regulating the size of the by-pass. By removing the plugs 54, the cylinder 10 and by-pass 52 may be filled with oil or other suitable liquid which forms the means of governing the reciprocation of the pistons and rod 15.

By referring to Figs. 1 and 3, it will be observed that when the Vcontrollin lever 47 is in the position shown by the fu l lines, (see Fig. 1), the portv 48 will connect the pbrts 41 and 42 and allow the air or steam to ass from the supply pipe 36 through the ead pipe 37 and port 39 into the end D of cylinder 4 thereby forcing the iston 25 in the direction of the arrow. W'iien the controlling lever 47 is in the position indicated by the dotted lines, the ports 48 and 49 are in the position shown by the full lines in Fig. 3, thus allowing the air or steam to ass from the supply pipe 36 through the lea pipe 38 and port ead pipes' The operation of my device is as follows:l

ser/,eve

similar manner through the port 40 and lead ipe 38 into port 49 and exhaust pipe 44.v he reci rocating motion of the piston 25 is imparte to the carriage 18 by means .of the piston rod 15.

It will be noted that when the piston 25 is moved in the direction of the arrow, lthe hereinbefore mentioned piston 22'is forced in the same direction by means of the piston rod 15. The said piston 22 is adapted to closely fit the bore ofcylinder 10 thereby forcing the liquid in cylinder 10 through the by-pass 52 from front to rear of the sald piston. By opening or closing the valve 53, a large or small volume of the iquid in cylinder 10 willbe allowedto pass through the said valve, thus regulating the speed of the pistons as desired in proportion to the opening. If it is desired to have the pistons move slowly in one direction and fast inthe opposite, an orifice 55 may be provided in the piston 23 as shown. A check valve 56, fitted to the piston 22, is adapted to close the said orifice when the pistons move in one direction and open when the said istons have a reverse movement, thereby alibwinglthe liquid to return to the opposite end of t e cylinder at a more rapid rate.

In Fig. 4 I have shown a counter-bore 57 formed on the inner periphery of the auxiliary cylinder for the purpose of increasing the speed of the return stroke of the iston after the cutter leaves the work there y eX- pediting the operation of the feeding mechanism. The increased speed is derived from the larger bore re resented by the counterbore 57 which al ows an increased flow of fluid ast the piston. It is obvious that the cylin er can be counter-bored at any point and for any length desired.

Having fully described my invention, what I claim and desire to secure by Letters Patastic fluid, a governing cylinder projecting through the head of the power cylinder, a carriage or the like for feedino` purposes connected to said piston rod, substantially as, and for the purpose described.

2. Ina fluid pressure feeding mechanism comprising a power cylindei', a pistonfittedtable connected to one end of said piston ro said power cylinder having orts formed in each end thereof, a supply pipe, a three-way valve connected to sau pipe, means to connect said three-way valve to each end of said power cylinder whereby fluid under pressure can enter either end of the^cylinder and be exhausted therefrom.

3. In a Iluid pressure feeding mechanism, thecomhination of power and governing cyl- `inders arranged in tandem with each other and connected together, pistons fitted to reciprocate in said cylinders, a piston rodconnecting both of said pistonswith one end projectin r from the ower cylinder, and a ieeding ta )le or the like connected to the piston rod, said governing cylinder containing a lliiid, a by-pass lconnecting each end of said governing cylinder, means on the by-pass to retard or permit the free passage of the fluid from either end of the governing cylinder for governing nir ioses.

4. ln a lliiii pressure feeding mechanism comprising a main power cylinder and an aiixi iai-y governin i cylinder, said governing cylinder being llledrwith oil, pistons fitted to reciprocate in said cylinders, a iston rod to connect said pistons to provi e for simultaneous reciprocatioii, a carriage connected to one end ol'- the iiston rod, ports provided in the power cylini er, a sup )ly pipe, a threeway valve attached to said pipe, means to connect said three-way valve' to both ends of the power cylinder whereby the iiluid under pressure can llow into either end of the i ower cylinder or be exhausted therefrom, su )stantially as and l'or the purpose described.

5. ln a feeding mechanism for milling machines or the like comprising a power cylin der, a piston lit'tcd to reciprocate therein, a governing cylinder et smaller diameter arranged in tandem with and connected to said power cylinder, afpiston 4litted to reciprocate in said governing cylinder having an apertiirelormed therein, a piston rod to connect both pistons, a carriage connected to one end of the piston rod, a valve to close said aper-l ture on one side when the piston iii the governing cylinder is moving in one direction whereby a quicker return movement can be obtained of the carl'iage, a by-pass connect- 65 in(y each end of the overning cylinder to )erinit the passage of' uid from either endo the cylinder, means on said by-pass to retard the flow of said lluid therethrough to regulate the s eed of the carriage, asand for'the purpose 70 i escribed.

6. ln a pressure feeding mechanism, a main power cylinder, a piston fitted thereto, cup-shaped washers secured to said piston, an auxiliary governing one end o'l s aid power cylinder, a piston fitted to reciprocate therein, a piston rod connecting the piston in the power cylinder and the piston in the regulating cylinder, a feeding table connected to power cylinder having ports formed in the ower portion thereof adjacent to each end, a supply pipe, a three-way valve connected thereto, means to, connect said three-way valve to bothends of said power cylinder to permit or prevent theqfllow of fluid under pressure to either end o'f said cylinder, and exhaust it therefrom, substantially as described and. for the purpose set fort 7. ln a feeding mechanism ir moving the table ci' a machine or the like, cylinders of dill'erent diameters arranged in tandem with each other and connected together, pistons fitted to said cylinders, a piston rod to carry said pistons, atable for feeding pur-poses connectcd to said piston rod, one of said cylinders adapted tofreceive iluid under pressure through ports iorincdin each end thereof and the other cylinder having its bore filled with oil to govern the reciprocation of the table, a

by-pass connecting )oth ends oi" said bore whereby the iliiid contained in the governing cylinder can pass from eitl'ier end of the cylinder when niovei nent is imparted to the piston,

cylinder connected to 75 said piston rodz said 80 means to obstruct the passage oi' the oil more 105 or lless therethrough.

8.V ,ln a feeding mechanism adapted to be attached to a movable table or the like, a

bracket, a power cylinder mounted on said bracket having )erts formed) in each end thereof, a piston ittcd to reciprocate/therein, said table being attached to one end oi the piston for feeding purposes, cup eshaped washers secured to said piston, an auxiliary cylindera piston litted thereto, a piston rod to connect both pistons, a supply pipe, a three-Way valve secured to said suppl pipe,\ ineens to connect the iorts of each en of the power cylinder to each side oi' the three-way valve whereby the llluid under pressure can be permitted to ilow into either end of the power cylinder or be exhausted therefrom, said auxiliary governing cylinder provided with screw-threaded orifices on cach end, a bypass connecting said orifices, means to o struct the passage Way of said by-pass when the lluid is passing from one end oi" the auxiliary cylinder to the opposite end.

-9. a uid pressure feeding device coming the movement of the carriage inboth di- 1 prising a power cylinder, a piston tted to rerectxons as described and set forth; ciprocetev theremil, an auxlliary govermng In testimony whereof I affix my signature cylinderilsd wit oil, a pistn fitted ttoirein presence of twol witnesses.

5 ciprocate t erein a; iston ro connec e to p p both pistons lwliere y both pistons move GEORGE THOMPSON' simultaneously when movement is imparted Witnesses; l l thereto, o. carriage connected to one end of JOHN H. CASS,

l tlie piston rod, said auxiliary cylinder governp PEARL AOKEBMAN. 

